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Extended septal myectomy operation. Lateral (A) and antero-posterior (B) views of an excised cardiac muscle specimen (weight 4.3 g). The cardiac muscle is excised via two incisions in the basal septum from 2 to 3 mm below the aortic valve and extended distally to the base of the papillary muscles, creating a trapezoid trough which is wider towards the left ventricular apex than at the subaortic level.
